Montague
Table of Contents
Overview
Executive Summary
Montague is a dedicated Information Stealer (Info-stealer) Trojan. Its primary objective is to silently infiltrate a Windows workstation, rapidly extract sensitive data (including saved browser passwords, cryptocurrency wallets, and session cookies), and exfiltrate this intelligence to a remote Command and Control (C2) server before the victim realizes the machine has been compromised.Infection Vector and Technical Capabilities
Montague is commonly distributed via highly targeted phishing campaigns, malicious links embedded in Discord or Telegram channels, or disguised as cracked software and game cheats on file-sharing networks. Upon execution, Montague is designed for speed and rapid data acquisition:- Browser Hooking and Extraction: The malware immediately targets the local storage databases of popular web browsers (Chrome, Edge, Firefox, Brave). It extracts saved plaintext passwords, auto-fill data (including credit card numbers), and active session cookies. Stolen session cookies allow attackers to bypass Two-Factor Authentication (2FA) for hijacked accounts.
- Cryptocurrency Targeting: Montague actively searches the local filesystem (specifically the `%AppData%` directory) for wallet files associated with popular cryptocurrency clients (e.g., Bitcoin Core, Electrum) and browser-based wallet extensions (like MetaMask).
- Rapid Exfiltration: Because Info-stealers do not necessarily need to maintain long-term persistence, Montague quickly bundles the stolen data into a compressed archive and transmits it to the attacker, often utilizing encrypted channels (HTTPS) or abusing legitimate APIs (like Telegram bots) to evade network detection.
Threat Assessment
A Montague infection is a critical data breach. The immediate theft of session cookies and passwords can lead directly to corporate network compromise, massive financial fraud, and severe identity theft. Attackers frequently sell these "logs" on dark web marketplaces to Initial Access Brokers (IABs).Incident Response and Remediation
- Immediate Network Isolation: Isolate the machine to halt any ongoing data exfiltration.
- Universal Credential Reset: Assume all passwords saved in the user's browser, as well as all active web sessions, are fully compromised. The user must force a logout of all active sessions and change all passwords from a known-secure device.
- Endpoint Eradication: Utilize enterprise EDR or anti-malware tools to locate and terminate the Montague process. Pay close attention to scheduled tasks or registry run keys, as some variants do attempt persistence to steal newly entered credentials.
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1003 | OS Credential Dumping (Built-in Mimikatz integration) | Credential Access | ATT&CK ↗ |
T1552.001 | Credentials In Files (Harvesting passwords and wallets from local storage) | Credential Access | ATT&CK ↗ |
T1555.003 | Credentials from Web Browsers | Unknown | ATT&CK ↗ |
T1048 | Exfiltration Over Alternative Protocol | Exfiltration | ATT&CK ↗ |
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1003: Monitor for LSASS memory dumping or registry SAM extraction. Enable Credential Guard on Windows systems.
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-LSA | LSASS Memory Protection | Harden | T1003 | Enable Windows Credential Guard (LsaCfgFlags) and restrict debug privileges (SeDebugPrivilege). |
D3-NDF | Network Data Filtering | Isolate | T1048 | Inspect non-standard port traffic and block unauthorized ICMP or DNS tunneling protocols at the network perimeter. |
D3-FPA | File Permission Auditing | Harden | T1552.001 | Scan filesystem repositories for plaintext configuration files and restrict access via Least Privilege RBAC controls. |
D3-CVH | Credential Vault Hardening | Harden | T1555.003 | Enable DPAPI master key audit logging and isolate browser SQLite database files within virtualization-based security containers. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_MONTAGUE_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Montague"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "montague" ascii wide nocase
$s2 = "trojan.pws.montague" ascii wide nocase
$s3 = "infostealer.montague" ascii wide nocase
$s4 = "win32/montague" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Montague (Trojan) Execution & Triage
id: 356d89eb-2758-5811-ae85-d4316cc78f81
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Montague malware family. Detects suspicious execution from temporary user
directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/montague
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1003
- attack.t1552_001
- attack.t1555_003
- attack.t1048
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \cmd.exe
- \powershell.exe
- \cscript.exe
- \wscript.exe
CommandLine|contains:
- AppData\Local\Temp
- -WindowStyle Hidden
- /e:jscript
- bitsadmin /transfer
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: mediumTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_MONTAGUE_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Montague tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "montague" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Montague from retrieving secondary stage payloads.
- Capture process memory triage to detect and terminate malicious threads injected by Montague into legitimate system processes such as explorer.exe or svchost.exe.
- Audit Windows Registry Run keys (HKCU\Software\Microsoft\Windows\CurrentVersion\Run) and Task Scheduler entries to locate and purge Montague persistence hooks.
- Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.
- Rotate all credentials, domain user passwords, and session cookies active on the system during the Montague execution timeframe.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not assume the incident is resolved simply because an antivirus tool removed the initial Montague dropper; always verify that secondary payloads and persistence hooks have been eradicated.
- Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Montague until memory triage is complete.
- Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution.
References & External Analysis
- Search "montague" on VirusTotal (External Analysis)
- Search "montague" on Any.Run (Sandbox Sandbox)
- Search "montague" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Montague and what threat category does it belong to?
Montague is classified as a Trojan. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments.
How does Montague establish persistence and evade defensive controls?
Montague typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks.
What are the essential incident response steps for mitigating a Montague compromise?
Security teams responding to Montague should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups.
What secondary payloads and staging behaviors are commonly associated with Trojan.PWS.Montague?
Trojan.PWS.Montague frequently operates as a loader or dropper designed to establish a foothold before downloading and executing secondary high-impact malware payloads. Depending on the threat actor's objectives, these dropped modules can range from ransomware and banking injects to modular infostealers and remote management backdoors.
How can security operations teams effectively detect and hunt for Trojan.PWS.Montague across enterprise endpoints?
Defenders should hunt for Trojan.PWS.Montague by deploying behavioral endpoint detection and response (EDR) rules that monitor suspicious process spawning (such as cmd.exe or powershell.exe spawned from office documents or temporary directories), anomalous outbound network connections from non-browser binaries, and unauthorized modifications to Windows Run keys and scheduled task registries.
How do I remove the Montague Trojan from Windows?
Manual removal of Montague is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Montague a virus or a Trojan?
Montague is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Montague typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Montague infection?
Symptoms of Montague can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Protect Your Network Against Trojans
Want to prevent Montague and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection for Businesses.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/montague.json
Ecosystem & Interactive Environments
This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.